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Study of Climate Change Impact to Local Rainfall Distribution in Lampung Provinces Manik, Tumiar Katarina; Rosadi, Bustomi; Nurhayati, Eva
Forum Geografi Vol 28, No 1 (2014)
Publisher : Universitas Muhammadiyah Surakarta

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Global warming which leads to climate change has potential affect to Indonesia agriculture activities and production. Analyzing rainfall pattern and distribution is important to investigate the impact of global climate change to local climate. This study using rainfall data from 1976-2010 from both lowland and upland area of Lampung Province. The results show that rainfall tends to decrease since the 1990s which related to the years with El Nino event. Monsoonal pattern- having rain and dry season- still excist in Lampung; however, since most rain fell below the average, it could not meet crops water need. Farmers conclude that dry seasons were longer and seasonal pattern has been changed. Global climate change might affect Lampung rainfall distribution through changes on sea surface temperature which could intensify the El Nino effect. Therefore, watching the El Nino phenomena and how global warming affects it, is important in predicting local climate especially the rainfall distribution in order to prevent significant loss in agriculture productivities.

Study of Climate Change Impact to Local Rainfall Distribution in Lampung Provinces Manik, Tumiar Katarina; Rosadi, Bustomi; Nurhayati, Eva
Forum Geografi Vol 28, No 1 (2014): July 2014
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v28i1.439

Global warming which leads to climate change has potential affect to Indonesia agriculture activities and production. Analyzing rainfall pattern and distribution is important to investigate the impact of global climate change to local climate. This study using rainfall data from 1976-2010 from both lowland and upland area of Lampung Province. The results show that rainfall tends to decrease since the 1990s which related to the years with El Nino event. Monsoonal pattern- having rain and dry season- still excist in Lampung; however, since most rain fell below the average, it could not meet crops water need. Farmers conclude that dry seasons were longer and seasonal pattern has been changed. Global climate change might affect Lampung rainfall distribution through changes on sea surface temperature which could intensify the El Nino effect. Therefore, watching the El Nino phenomena and how global warming affects it, is important in predicting local climate especially the rainfall distribution in order to prevent significant loss in agriculture productivities.

Pendugaan Kebutuhan Air Tanaman Nanas (Ananas Comosus l. Merr) Menggunakan Model Cropwat Tusi, Ahmad; Rosadi, Bustomi; Triana, Maruli
Jurnal Irigasi Vol 7, No 1 (2012): Jurnal Irigasi
Publisher : Balai Teknik Irigasi

Pineapple is one of the potential plantation industries in Lampung Province. There are problems faced off in pineapple irrigation such as when and how much water must be applied to meet acceptable productivity and quality. The objective of this research was to know the water requirements by investigating and evaluating measurement methods of evapotranspiration using CROPWAT model. This research was conducted on Pineapple Farm in Terbanggi Besar, Lampung Tengah from October 2006 to January 2007. Three measurement methods of evapotranspiration applied were CROPWAT Model, based on Pineapple Farm calculation (control) and Pan evaporation Method were conducted and arranged in Randomized Completely Block (RCB) design with six replications. The results showed that the daily water requirements on October until December with 10-days irrigation frequency for CROPWAT Model were 1.25, 1.16, and 1.07 mm/day respectively; with the Control Method were 1.20 mm/day; and with Pan evaporation method were 1.13, 1.02, and 0.9 mm/day. Water requirements for plant was enough without suffering water stress. The comparison results showed that the evapotranspiration derived from CROPWAT Model data are generally 4.3% lower than Control data but by the Pan Evaporation were generally 16.4% lower than Control data. So, it confirmed that The average trend of plant growth indicators from CROPWAT Model having a reasonable good results for irrigation scheduling.

Analysis Of Water Balance Of Corn (Zea Mays) In Bandar Lampung Muamar, Muamar; Triyomo, Sugeng; Tusi, Ahmad; Rosadi, Bustomi
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 1, No 1 (2012)
Publisher : The University of Lampung

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Indonesia needs of the community against corn continues to increase with increasing population growth as well. One effort to support the increased productivity of corn agribusiness development program is the provision of adequate water for plant growth. This aims of the research were (1) calculate the amount of corn crop water requirements, (2) quantify the potential of rainwater that can be utilized and stored, (3) analyze the potential evapotranspiration, percolation and runoff rate, (4) to calculate Kc plants. Field experiment was conducted at the Integrated Field Laboratory College of Agriculture, University of Lampung from 26 August to 4 December 2011. Field observations carried out on two experimental treatment with four repettition, the treatment were plots with plastic liner (plot A) and without plastic liner (plot B) where are each equipped with a water storage pond at the downstream. The results showed that (1) The consumptive use (ETc) during the study water requirements of corn is 614,3 mm. (2) Total runoff that occurs on a plot with plastic liner adn without plastic liner of land is 58,96 mm and 37,24 mm. (3) Percolation that occurred during the study in the plot of land without plastic liner is 40,58 mm. (4) The corn crop coefficient (Kc) on average in the early developmental stages, vegetative stage, stage of flowering and seed formation, and aging stage were 1,26; 1,72; 1,66 and 1,02. (5) the water productivity on plot A was 1,88 kg/m3 while on the plot B was 2,48 kg/m3. Keywords: water balance, corn, evapotranspiration, percolation, surface runoff.

ANALISIS SPASIAL LAHAN PERTANIAN PANGAN BERKELANJUTAN (LP2B) DI KABUPATEN PESAWARAN Pratama, Agung; Amin, Mohamad; Asmara, Sandi; Rosadi, Bustomi
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 7, No 1 (2018): April
Publisher : The University of Lampung

ABSTRACTÂ Land is the main factor in developing agriculture.Â The increase of populationâ€™s number and economy activity, give impact to landâ€™s needs.Â This should trigger land conversion happen.Â Land conversion would be a problem if that happens on productive agricultural land.Â According to BPS Pesawaran, that every years the harvested area of rice crops decreased in Pesawaran regency.Â Lahan Pertanian Pangan Berkelanjutan (LP2B) is the governmentâ€™s effort in protecting and overcome land conversion of food agricultural land.The purpose of this research was to analyze the potential of Lahan Pertanian Pangan Berkelanjutan (LP2B) and Lahan Cadangan Pangan Berkelanjutan (LCP2B) in Pesawaran regency.Â The decree of LP2B and LCP2B refers to Constitution number 41 in 2009 about Perlindungan Lahan Pertanian Pangan Berkelanjutan (UU PLPPB).The potency of LP2B in Pesawaran regency is as large as the total potencyâ€™s wide of Lahan Pertanian Pangan Berkelanjutan (LP2B) in Pesawaran regency that is 10.236,49 Ha, which is consisted as potency of Lahan Cadangan Pertanian Pangan Berkelanjutan (LCP2B) of 1.294,06 Ha.Â Keywords : Land conversion, LP2B, LCP2B, and Pesawaran Regency.

PENGARUH DEFISIT EVAPOTRANSPIRASI DALAM REGULATED DEFICIT IRRIGATION (RDI) PADA KEDELAI (Glycine Max[L.] Merr.) R. A.Bustomi Rosadi; Ridwan .; Nugroho Haryono; Omi Istiawati
Jurnal Keteknikan Pertanian Vol. 20 No. 1 (2006): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.020.1.%p

ABSTRACT The objective of this research was to investigate the effect of deficit evapotranspiration in regulated deficit irrigation (RDI) on soybean. This research was conducted on an experimental farm under plastic house of Lampung Polytechnique from Augustus to Nupember 2004. The deficit evapotranspiration treatment rates were ET1, (1.0XETC), ET2 (0.8XETC), ET4 (0.4XETC) and ET5 (0.2XETC). Arranged in a randomized block design with four reflications. Irrigation was given at two days interval. The regulated deficit irrigation (RDI) treatment just at vegetative period and its treatmens were stopped at the beginning of flowering phase and afterward the treatmens were watered at 1. 0xetc. The soil water content was monitored by porous blocks. The result showed that soybean plant strated to be stressed at week II with qc = 224.03 %, and Ks = 0.60 when watered at o.6xetc. the optimum yield of soybean plant (31.04 g/plant/0 with CWR=200.39 mm was reached by deficit irrigation at 0.8xetc during the vegetative period. Keywords: ultisol, regulated deficit irrigation, soybean, water stress coefficent

PENDUGAAN KOEFISIEN TANAMAN UNTUK MENGHITUNG KEBUTUHAN AIR DAN MENGATUR JADUAL TANAM KEDELAI DI LAHAN KERING LAMPUNG Tumiar K K. Manik; R.A. Bustomi Rosadi; Agus Karyanto; Anggun Ika Pratya
JURNAL AGROTROPIKA Vol 15, No 2 (2010): Agrotropika Vol.15 No.2 2010
Publisher : Universitas Lampung

One strategic agriculture commodity for Indonesia is soybean. Therefore, Indonesia should make an effort to be self sufficient in soybean production. For that purpose the planting area should be extended to dry land area. Crops water need is one important factor that needs to be considered in cultivating crops over dry land area. Calculating crops water need is necessary for irrigation schedule and plating date. Crops water need is calculated with measuring the crops evapotranspiration Crops evapotranspiration is calculated using gravimetric method or with lysimeter. Reference evapotranspiration is calculated in some different methods such as gravimetric method, using evaporimeter pan or using estimation models. Crops coeficient is calculated with dividing crops evapotranspiration with reference evapotranspiration. The purpose of this research is to calculate soybean crops coefficient in order to recommend soybean planting date in Lampung dry land. Crops evapotranspiration was calculated in gravimetric methods while reference evapotranspiration was calculated with gravimetric method, evaporimeter pan and Penman-Monteith model. The results showed that maximum crop evapotranspiration was 20 mm/week or about 3 mm/day while maximum reference evapotranspiration was 24 mm/week. Soybean crop coefficients were 0.36 in cotyledon phase (VE) to V1 phase; 0.42 on V2 phase; 0.76 on V3 phase; 0.68 on R1 phase; 1.10 on phase R3; 0.78 on R5 phase and 0.21 on R8 phase. Monts which are suitable for planting soybean are December to May. Therefore, soybean could be planted in dry land without irrigation facilities one time after paddy (December – February) or twice as long as at the first planting date the area is in good drainage condition. Key words: crops evapotranspiraton, crops coefficients, crops water need, reference evapo-transpiration, planting date

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